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CPC Subgroup
F15B 21/04

Special measures taken in connection with the properties of the fluid

Full Title

Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass > Special measures taken in connection with the properties of the fluid

6 direct subcodes

Child Classifications

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  • F15B 21/041 Removal or measurement of solid or liquid contamination, e.g. filtering
  • F15B 21/044 Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
  • F15B 21/045 Compensating for variations in viscosity or temperature
  • F15B 21/047 Preventing foaming, churning or cavitation
  • F15B 21/048 Arrangements for compressed air preparation, e.g. comprising air driers, air condensers, filters, lubricators or pressure regulators

Top Applicants

Top 10 applicants by patent filingsfor class F15, 2013–2023, worldwide · Source: EPO PATSTAT

  1. ROBERT BOSCH DE 1,281
  2. SMC CORPORATION JP 865
  3. HITACHI CONSTRUCTION MACHINERY COMPANY JP 814
  4. KYB CORPORATION JP 584
  5. SCHAEFFLER TECHNOLOGIES & COMPANY DE 536
  6. CATERPILLAR US 532
  7. FESTO & COMPANY DE 486
  8. JOHN DEERE US 419
  9. KAWASAKI HEAVY IND JP 368
  10. HAMILTON SUNDSTRAND US 368